Arriving on an excursion to St. Petersburg, classmates Dan and Lev witness the theft of the famous Chizhik-Pyzhik. According to legend, if you make a wish and throw a coin onto the pedestal of the monument without dropping it into the water, your wish will certainly come true. But Chizhik is missing! Does this mean that the guys will never be able to realize their dreams and Leva's parents will still get divorced, and Dana will not become a famous blogger? Brave schoolchildren rush in search of the kidnappers, hiding from teachers, parents urgently called from Yekaterinburg, police officers, and even from Peter the Great himself.